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36edc939 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
ac45e57f PMS |
2 | /* |
3 | * si1145.c - Support for Silabs SI1132 and SI1141/2/3/5/6/7 combined ambient | |
4 | * light, UV index and proximity sensors | |
5 | * | |
6 | * Copyright 2014-16 Peter Meerwald-Stadler <pmeerw@pmeerw.net> | |
7 | * Copyright 2016 Crestez Dan Leonard <leonard.crestez@intel.com> | |
8 | * | |
ac45e57f PMS |
9 | * SI1132 (7-bit I2C slave address 0x60) |
10 | * SI1141/2/3 (7-bit I2C slave address 0x5a) | |
11 | * SI1145/6/6 (7-bit I2C slave address 0x60) | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/err.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/delay.h> | |
19 | #include <linux/irq.h> | |
20 | #include <linux/gpio.h> | |
21 | ||
22 | #include <linux/iio/iio.h> | |
23 | #include <linux/iio/sysfs.h> | |
24 | #include <linux/iio/trigger.h> | |
25 | #include <linux/iio/trigger_consumer.h> | |
26 | #include <linux/iio/triggered_buffer.h> | |
27 | #include <linux/iio/buffer.h> | |
28 | #include <linux/util_macros.h> | |
29 | ||
30 | #define SI1145_REG_PART_ID 0x00 | |
31 | #define SI1145_REG_REV_ID 0x01 | |
32 | #define SI1145_REG_SEQ_ID 0x02 | |
33 | #define SI1145_REG_INT_CFG 0x03 | |
34 | #define SI1145_REG_IRQ_ENABLE 0x04 | |
35 | #define SI1145_REG_IRQ_MODE 0x05 | |
36 | #define SI1145_REG_HW_KEY 0x07 | |
37 | #define SI1145_REG_MEAS_RATE 0x08 | |
38 | #define SI1145_REG_PS_LED21 0x0f | |
39 | #define SI1145_REG_PS_LED3 0x10 | |
40 | #define SI1145_REG_UCOEF1 0x13 | |
41 | #define SI1145_REG_UCOEF2 0x14 | |
42 | #define SI1145_REG_UCOEF3 0x15 | |
43 | #define SI1145_REG_UCOEF4 0x16 | |
44 | #define SI1145_REG_PARAM_WR 0x17 | |
45 | #define SI1145_REG_COMMAND 0x18 | |
46 | #define SI1145_REG_RESPONSE 0x20 | |
47 | #define SI1145_REG_IRQ_STATUS 0x21 | |
48 | #define SI1145_REG_ALSVIS_DATA 0x22 | |
49 | #define SI1145_REG_ALSIR_DATA 0x24 | |
50 | #define SI1145_REG_PS1_DATA 0x26 | |
51 | #define SI1145_REG_PS2_DATA 0x28 | |
52 | #define SI1145_REG_PS3_DATA 0x2a | |
53 | #define SI1145_REG_AUX_DATA 0x2c | |
54 | #define SI1145_REG_PARAM_RD 0x2e | |
55 | #define SI1145_REG_CHIP_STAT 0x30 | |
56 | ||
57 | #define SI1145_UCOEF1_DEFAULT 0x7b | |
58 | #define SI1145_UCOEF2_DEFAULT 0x6b | |
59 | #define SI1145_UCOEF3_DEFAULT 0x01 | |
60 | #define SI1145_UCOEF4_DEFAULT 0x00 | |
61 | ||
62 | /* Helper to figure out PS_LED register / shift per channel */ | |
63 | #define SI1145_PS_LED_REG(ch) \ | |
64 | (((ch) == 2) ? SI1145_REG_PS_LED3 : SI1145_REG_PS_LED21) | |
65 | #define SI1145_PS_LED_SHIFT(ch) \ | |
66 | (((ch) == 1) ? 4 : 0) | |
67 | ||
68 | /* Parameter offsets */ | |
69 | #define SI1145_PARAM_CHLIST 0x01 | |
70 | #define SI1145_PARAM_PSLED12_SELECT 0x02 | |
71 | #define SI1145_PARAM_PSLED3_SELECT 0x03 | |
72 | #define SI1145_PARAM_PS_ENCODING 0x05 | |
73 | #define SI1145_PARAM_ALS_ENCODING 0x06 | |
74 | #define SI1145_PARAM_PS1_ADC_MUX 0x07 | |
75 | #define SI1145_PARAM_PS2_ADC_MUX 0x08 | |
76 | #define SI1145_PARAM_PS3_ADC_MUX 0x09 | |
77 | #define SI1145_PARAM_PS_ADC_COUNTER 0x0a | |
78 | #define SI1145_PARAM_PS_ADC_GAIN 0x0b | |
79 | #define SI1145_PARAM_PS_ADC_MISC 0x0c | |
80 | #define SI1145_PARAM_ALS_ADC_MUX 0x0d | |
81 | #define SI1145_PARAM_ALSIR_ADC_MUX 0x0e | |
82 | #define SI1145_PARAM_AUX_ADC_MUX 0x0f | |
83 | #define SI1145_PARAM_ALSVIS_ADC_COUNTER 0x10 | |
84 | #define SI1145_PARAM_ALSVIS_ADC_GAIN 0x11 | |
85 | #define SI1145_PARAM_ALSVIS_ADC_MISC 0x12 | |
86 | #define SI1145_PARAM_LED_RECOVERY 0x1c | |
87 | #define SI1145_PARAM_ALSIR_ADC_COUNTER 0x1d | |
88 | #define SI1145_PARAM_ALSIR_ADC_GAIN 0x1e | |
89 | #define SI1145_PARAM_ALSIR_ADC_MISC 0x1f | |
90 | #define SI1145_PARAM_ADC_OFFSET 0x1a | |
91 | ||
92 | /* Channel enable masks for CHLIST parameter */ | |
93 | #define SI1145_CHLIST_EN_PS1 BIT(0) | |
94 | #define SI1145_CHLIST_EN_PS2 BIT(1) | |
95 | #define SI1145_CHLIST_EN_PS3 BIT(2) | |
96 | #define SI1145_CHLIST_EN_ALSVIS BIT(4) | |
97 | #define SI1145_CHLIST_EN_ALSIR BIT(5) | |
98 | #define SI1145_CHLIST_EN_AUX BIT(6) | |
99 | #define SI1145_CHLIST_EN_UV BIT(7) | |
100 | ||
101 | /* Proximity measurement mode for ADC_MISC parameter */ | |
102 | #define SI1145_PS_ADC_MODE_NORMAL BIT(2) | |
103 | /* Signal range mask for ADC_MISC parameter */ | |
104 | #define SI1145_ADC_MISC_RANGE BIT(5) | |
105 | ||
106 | /* Commands for REG_COMMAND */ | |
107 | #define SI1145_CMD_NOP 0x00 | |
108 | #define SI1145_CMD_RESET 0x01 | |
109 | #define SI1145_CMD_PS_FORCE 0x05 | |
110 | #define SI1145_CMD_ALS_FORCE 0x06 | |
111 | #define SI1145_CMD_PSALS_FORCE 0x07 | |
112 | #define SI1145_CMD_PS_PAUSE 0x09 | |
113 | #define SI1145_CMD_ALS_PAUSE 0x0a | |
114 | #define SI1145_CMD_PSALS_PAUSE 0x0b | |
115 | #define SI1145_CMD_PS_AUTO 0x0d | |
116 | #define SI1145_CMD_ALS_AUTO 0x0e | |
117 | #define SI1145_CMD_PSALS_AUTO 0x0f | |
118 | #define SI1145_CMD_PARAM_QUERY 0x80 | |
119 | #define SI1145_CMD_PARAM_SET 0xa0 | |
120 | ||
121 | #define SI1145_RSP_INVALID_SETTING 0x80 | |
122 | #define SI1145_RSP_COUNTER_MASK 0x0F | |
123 | ||
124 | /* Minimum sleep after each command to ensure it's received */ | |
125 | #define SI1145_COMMAND_MINSLEEP_MS 5 | |
126 | /* Return -ETIMEDOUT after this long */ | |
127 | #define SI1145_COMMAND_TIMEOUT_MS 25 | |
128 | ||
129 | /* Interrupt configuration masks for INT_CFG register */ | |
130 | #define SI1145_INT_CFG_OE BIT(0) /* enable interrupt */ | |
131 | #define SI1145_INT_CFG_MODE BIT(1) /* auto reset interrupt pin */ | |
132 | ||
133 | /* Interrupt enable masks for IRQ_ENABLE register */ | |
134 | #define SI1145_MASK_ALL_IE (BIT(4) | BIT(3) | BIT(2) | BIT(0)) | |
135 | ||
136 | #define SI1145_MUX_TEMP 0x65 | |
137 | #define SI1145_MUX_VDD 0x75 | |
138 | ||
139 | /* Proximity LED current; see Table 2 in datasheet */ | |
140 | #define SI1145_LED_CURRENT_45mA 0x04 | |
141 | ||
142 | enum { | |
143 | SI1132, | |
144 | SI1141, | |
145 | SI1142, | |
146 | SI1143, | |
147 | SI1145, | |
148 | SI1146, | |
149 | SI1147, | |
150 | }; | |
151 | ||
152 | struct si1145_part_info { | |
153 | u8 part; | |
154 | const struct iio_info *iio_info; | |
155 | const struct iio_chan_spec *channels; | |
156 | unsigned int num_channels; | |
157 | unsigned int num_leds; | |
158 | bool uncompressed_meas_rate; | |
159 | }; | |
160 | ||
161 | /** | |
162 | * struct si1145_data - si1145 chip state data | |
163 | * @client: I2C client | |
164 | * @lock: mutex to protect shared state. | |
165 | * @cmdlock: Low-level mutex to protect command execution only | |
166 | * @rsp_seq: Next expected response number or -1 if counter reset required | |
167 | * @scan_mask: Saved scan mask to avoid duplicate set_chlist | |
168 | * @autonomous: If automatic measurements are active (for buffer support) | |
169 | * @part_info: Part information | |
170 | * @trig: Pointer to iio trigger | |
171 | * @meas_rate: Value of MEAS_RATE register. Only set in HW in auto mode | |
172 | */ | |
173 | struct si1145_data { | |
174 | struct i2c_client *client; | |
175 | struct mutex lock; | |
176 | struct mutex cmdlock; | |
177 | int rsp_seq; | |
178 | const struct si1145_part_info *part_info; | |
179 | unsigned long scan_mask; | |
180 | bool autonomous; | |
181 | struct iio_trigger *trig; | |
182 | int meas_rate; | |
183 | }; | |
184 | ||
185 | /** | |
186 | * __si1145_command_reset() - Send CMD_NOP and wait for response 0 | |
187 | * | |
188 | * Does not modify data->rsp_seq | |
189 | * | |
190 | * Return: 0 on success and -errno on error. | |
191 | */ | |
192 | static int __si1145_command_reset(struct si1145_data *data) | |
193 | { | |
194 | struct device *dev = &data->client->dev; | |
195 | unsigned long stop_jiffies; | |
196 | int ret; | |
197 | ||
198 | ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, | |
199 | SI1145_CMD_NOP); | |
200 | if (ret < 0) | |
201 | return ret; | |
202 | msleep(SI1145_COMMAND_MINSLEEP_MS); | |
203 | ||
204 | stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000; | |
205 | while (true) { | |
206 | ret = i2c_smbus_read_byte_data(data->client, | |
207 | SI1145_REG_RESPONSE); | |
208 | if (ret <= 0) | |
209 | return ret; | |
210 | if (time_after(jiffies, stop_jiffies)) { | |
211 | dev_warn(dev, "timeout on reset\n"); | |
212 | return -ETIMEDOUT; | |
213 | } | |
214 | msleep(SI1145_COMMAND_MINSLEEP_MS); | |
215 | continue; | |
216 | } | |
217 | } | |
218 | ||
219 | /** | |
220 | * si1145_command() - Execute a command and poll the response register | |
221 | * | |
222 | * All conversion overflows are reported as -EOVERFLOW | |
223 | * INVALID_SETTING is reported as -EINVAL | |
224 | * Timeouts are reported as -ETIMEDOUT | |
225 | * | |
226 | * Return: 0 on success or -errno on failure | |
227 | */ | |
228 | static int si1145_command(struct si1145_data *data, u8 cmd) | |
229 | { | |
230 | struct device *dev = &data->client->dev; | |
231 | unsigned long stop_jiffies; | |
232 | int ret; | |
233 | ||
234 | mutex_lock(&data->cmdlock); | |
235 | ||
236 | if (data->rsp_seq < 0) { | |
237 | ret = __si1145_command_reset(data); | |
238 | if (ret < 0) { | |
239 | dev_err(dev, "failed to reset command counter, ret=%d\n", | |
240 | ret); | |
241 | goto out; | |
242 | } | |
243 | data->rsp_seq = 0; | |
244 | } | |
245 | ||
246 | ret = i2c_smbus_write_byte_data(data->client, SI1145_REG_COMMAND, cmd); | |
247 | if (ret) { | |
248 | dev_warn(dev, "failed to write command, ret=%d\n", ret); | |
249 | goto out; | |
250 | } | |
251 | /* Sleep a little to ensure the command is received */ | |
252 | msleep(SI1145_COMMAND_MINSLEEP_MS); | |
253 | ||
254 | stop_jiffies = jiffies + SI1145_COMMAND_TIMEOUT_MS * HZ / 1000; | |
255 | while (true) { | |
256 | ret = i2c_smbus_read_byte_data(data->client, | |
257 | SI1145_REG_RESPONSE); | |
258 | if (ret < 0) { | |
259 | dev_warn(dev, "failed to read response, ret=%d\n", ret); | |
260 | break; | |
261 | } | |
262 | ||
263 | if ((ret & ~SI1145_RSP_COUNTER_MASK) == 0) { | |
264 | if (ret == data->rsp_seq) { | |
265 | if (time_after(jiffies, stop_jiffies)) { | |
266 | dev_warn(dev, "timeout on command %#02hhx\n", | |
267 | cmd); | |
268 | ret = -ETIMEDOUT; | |
269 | break; | |
270 | } | |
271 | msleep(SI1145_COMMAND_MINSLEEP_MS); | |
272 | continue; | |
273 | } | |
274 | if (ret == ((data->rsp_seq + 1) & | |
275 | SI1145_RSP_COUNTER_MASK)) { | |
276 | data->rsp_seq = ret; | |
277 | ret = 0; | |
278 | break; | |
279 | } | |
280 | dev_warn(dev, "unexpected response counter %d instead of %d\n", | |
281 | ret, (data->rsp_seq + 1) & | |
282 | SI1145_RSP_COUNTER_MASK); | |
283 | ret = -EIO; | |
284 | } else { | |
285 | if (ret == SI1145_RSP_INVALID_SETTING) { | |
286 | dev_warn(dev, "INVALID_SETTING error on command %#02hhx\n", | |
287 | cmd); | |
288 | ret = -EINVAL; | |
289 | } else { | |
290 | /* All overflows are treated identically */ | |
291 | dev_dbg(dev, "overflow, ret=%d, cmd=%#02hhx\n", | |
292 | ret, cmd); | |
293 | ret = -EOVERFLOW; | |
294 | } | |
295 | } | |
296 | ||
297 | /* Force a counter reset next time */ | |
298 | data->rsp_seq = -1; | |
299 | break; | |
300 | } | |
301 | ||
302 | out: | |
303 | mutex_unlock(&data->cmdlock); | |
304 | ||
305 | return ret; | |
306 | } | |
307 | ||
308 | static int si1145_param_update(struct si1145_data *data, u8 op, u8 param, | |
309 | u8 value) | |
310 | { | |
311 | int ret; | |
312 | ||
313 | ret = i2c_smbus_write_byte_data(data->client, | |
314 | SI1145_REG_PARAM_WR, value); | |
315 | if (ret < 0) | |
316 | return ret; | |
317 | ||
318 | return si1145_command(data, op | (param & 0x1F)); | |
319 | } | |
320 | ||
321 | static int si1145_param_set(struct si1145_data *data, u8 param, u8 value) | |
322 | { | |
323 | return si1145_param_update(data, SI1145_CMD_PARAM_SET, param, value); | |
324 | } | |
325 | ||
326 | /* Set param. Returns negative errno or current value */ | |
327 | static int si1145_param_query(struct si1145_data *data, u8 param) | |
328 | { | |
329 | int ret; | |
330 | ||
331 | ret = si1145_command(data, SI1145_CMD_PARAM_QUERY | (param & 0x1F)); | |
332 | if (ret < 0) | |
333 | return ret; | |
334 | ||
335 | return i2c_smbus_read_byte_data(data->client, SI1145_REG_PARAM_RD); | |
336 | } | |
337 | ||
338 | /* Expand 8 bit compressed value to 16 bit, see Silabs AN498 */ | |
339 | static u16 si1145_uncompress(u8 x) | |
340 | { | |
341 | u16 result = 0; | |
342 | u8 exponent = 0; | |
343 | ||
344 | if (x < 8) | |
345 | return 0; | |
346 | ||
347 | exponent = (x & 0xf0) >> 4; | |
348 | result = 0x10 | (x & 0x0f); | |
349 | ||
350 | if (exponent >= 4) | |
351 | return result << (exponent - 4); | |
352 | return result >> (4 - exponent); | |
353 | } | |
354 | ||
355 | /* Compress 16 bit value to 8 bit, see Silabs AN498 */ | |
356 | static u8 si1145_compress(u16 x) | |
357 | { | |
358 | u32 exponent = 0; | |
359 | u32 significand = 0; | |
360 | u32 tmp = x; | |
361 | ||
362 | if (x == 0x0000) | |
363 | return 0x00; | |
364 | if (x == 0x0001) | |
365 | return 0x08; | |
366 | ||
367 | while (1) { | |
368 | tmp >>= 1; | |
369 | exponent += 1; | |
370 | if (tmp == 1) | |
371 | break; | |
372 | } | |
373 | ||
374 | if (exponent < 5) { | |
375 | significand = x << (4 - exponent); | |
376 | return (exponent << 4) | (significand & 0xF); | |
377 | } | |
378 | ||
379 | significand = x >> (exponent - 5); | |
380 | if (significand & 1) { | |
381 | significand += 2; | |
382 | if (significand & 0x0040) { | |
383 | exponent += 1; | |
384 | significand >>= 1; | |
385 | } | |
386 | } | |
387 | ||
388 | return (exponent << 4) | ((significand >> 1) & 0xF); | |
389 | } | |
390 | ||
391 | /* Write meas_rate in hardware */ | |
392 | static int si1145_set_meas_rate(struct si1145_data *data, int interval) | |
393 | { | |
394 | if (data->part_info->uncompressed_meas_rate) | |
395 | return i2c_smbus_write_word_data(data->client, | |
396 | SI1145_REG_MEAS_RATE, interval); | |
397 | else | |
398 | return i2c_smbus_write_byte_data(data->client, | |
399 | SI1145_REG_MEAS_RATE, interval); | |
400 | } | |
401 | ||
402 | static int si1145_read_samp_freq(struct si1145_data *data, int *val, int *val2) | |
403 | { | |
404 | *val = 32000; | |
405 | if (data->part_info->uncompressed_meas_rate) | |
406 | *val2 = data->meas_rate; | |
407 | else | |
408 | *val2 = si1145_uncompress(data->meas_rate); | |
409 | return IIO_VAL_FRACTIONAL; | |
410 | } | |
411 | ||
412 | /* Set the samp freq in driver private data */ | |
413 | static int si1145_store_samp_freq(struct si1145_data *data, int val) | |
414 | { | |
415 | int ret = 0; | |
416 | int meas_rate; | |
417 | ||
418 | if (val <= 0 || val > 32000) | |
419 | return -ERANGE; | |
420 | meas_rate = 32000 / val; | |
421 | ||
422 | mutex_lock(&data->lock); | |
423 | if (data->autonomous) { | |
424 | ret = si1145_set_meas_rate(data, meas_rate); | |
425 | if (ret) | |
426 | goto out; | |
427 | } | |
428 | if (data->part_info->uncompressed_meas_rate) | |
429 | data->meas_rate = meas_rate; | |
430 | else | |
431 | data->meas_rate = si1145_compress(meas_rate); | |
432 | ||
433 | out: | |
434 | mutex_unlock(&data->lock); | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
439 | static irqreturn_t si1145_trigger_handler(int irq, void *private) | |
440 | { | |
441 | struct iio_poll_func *pf = private; | |
442 | struct iio_dev *indio_dev = pf->indio_dev; | |
443 | struct si1145_data *data = iio_priv(indio_dev); | |
444 | /* | |
445 | * Maximum buffer size: | |
446 | * 6*2 bytes channels data + 4 bytes alignment + | |
447 | * 8 bytes timestamp | |
448 | */ | |
449 | u8 buffer[24]; | |
450 | int i, j = 0; | |
451 | int ret; | |
452 | u8 irq_status = 0; | |
453 | ||
454 | if (!data->autonomous) { | |
455 | ret = si1145_command(data, SI1145_CMD_PSALS_FORCE); | |
456 | if (ret < 0 && ret != -EOVERFLOW) | |
457 | goto done; | |
458 | } else { | |
459 | irq_status = ret = i2c_smbus_read_byte_data(data->client, | |
460 | SI1145_REG_IRQ_STATUS); | |
461 | if (ret < 0) | |
462 | goto done; | |
463 | if (!(irq_status & SI1145_MASK_ALL_IE)) | |
464 | goto done; | |
465 | } | |
466 | ||
467 | for_each_set_bit(i, indio_dev->active_scan_mask, | |
468 | indio_dev->masklength) { | |
469 | int run = 1; | |
470 | ||
471 | while (i + run < indio_dev->masklength) { | |
472 | if (!test_bit(i + run, indio_dev->active_scan_mask)) | |
473 | break; | |
474 | if (indio_dev->channels[i + run].address != | |
475 | indio_dev->channels[i].address + 2 * run) | |
476 | break; | |
477 | run++; | |
478 | } | |
479 | ||
480 | ret = i2c_smbus_read_i2c_block_data_or_emulated( | |
481 | data->client, indio_dev->channels[i].address, | |
482 | sizeof(u16) * run, &buffer[j]); | |
483 | if (ret < 0) | |
484 | goto done; | |
485 | j += run * sizeof(u16); | |
486 | i += run - 1; | |
487 | } | |
488 | ||
489 | if (data->autonomous) { | |
490 | ret = i2c_smbus_write_byte_data(data->client, | |
491 | SI1145_REG_IRQ_STATUS, | |
492 | irq_status & SI1145_MASK_ALL_IE); | |
493 | if (ret < 0) | |
494 | goto done; | |
495 | } | |
496 | ||
497 | iio_push_to_buffers_with_timestamp(indio_dev, buffer, | |
498 | iio_get_time_ns(indio_dev)); | |
499 | ||
500 | done: | |
501 | iio_trigger_notify_done(indio_dev->trig); | |
502 | return IRQ_HANDLED; | |
503 | } | |
504 | ||
505 | static int si1145_set_chlist(struct iio_dev *indio_dev, unsigned long scan_mask) | |
506 | { | |
507 | struct si1145_data *data = iio_priv(indio_dev); | |
508 | u8 reg = 0, mux; | |
509 | int ret; | |
510 | int i; | |
511 | ||
512 | /* channel list already set, no need to reprogram */ | |
513 | if (data->scan_mask == scan_mask) | |
514 | return 0; | |
515 | ||
516 | for_each_set_bit(i, &scan_mask, indio_dev->masklength) { | |
517 | switch (indio_dev->channels[i].address) { | |
518 | case SI1145_REG_ALSVIS_DATA: | |
519 | reg |= SI1145_CHLIST_EN_ALSVIS; | |
520 | break; | |
521 | case SI1145_REG_ALSIR_DATA: | |
522 | reg |= SI1145_CHLIST_EN_ALSIR; | |
523 | break; | |
524 | case SI1145_REG_PS1_DATA: | |
525 | reg |= SI1145_CHLIST_EN_PS1; | |
526 | break; | |
527 | case SI1145_REG_PS2_DATA: | |
528 | reg |= SI1145_CHLIST_EN_PS2; | |
529 | break; | |
530 | case SI1145_REG_PS3_DATA: | |
531 | reg |= SI1145_CHLIST_EN_PS3; | |
532 | break; | |
533 | case SI1145_REG_AUX_DATA: | |
534 | switch (indio_dev->channels[i].type) { | |
535 | case IIO_UVINDEX: | |
536 | reg |= SI1145_CHLIST_EN_UV; | |
537 | break; | |
538 | default: | |
539 | reg |= SI1145_CHLIST_EN_AUX; | |
540 | if (indio_dev->channels[i].type == IIO_TEMP) | |
541 | mux = SI1145_MUX_TEMP; | |
542 | else | |
543 | mux = SI1145_MUX_VDD; | |
544 | ret = si1145_param_set(data, | |
545 | SI1145_PARAM_AUX_ADC_MUX, mux); | |
546 | if (ret < 0) | |
547 | return ret; | |
548 | ||
549 | break; | |
550 | } | |
551 | } | |
552 | } | |
553 | ||
554 | data->scan_mask = scan_mask; | |
555 | ret = si1145_param_set(data, SI1145_PARAM_CHLIST, reg); | |
556 | ||
557 | return ret < 0 ? ret : 0; | |
558 | } | |
559 | ||
560 | static int si1145_measure(struct iio_dev *indio_dev, | |
561 | struct iio_chan_spec const *chan) | |
562 | { | |
563 | struct si1145_data *data = iio_priv(indio_dev); | |
564 | u8 cmd; | |
565 | int ret; | |
566 | ||
567 | ret = si1145_set_chlist(indio_dev, BIT(chan->scan_index)); | |
568 | if (ret < 0) | |
569 | return ret; | |
570 | ||
571 | cmd = (chan->type == IIO_PROXIMITY) ? SI1145_CMD_PS_FORCE : | |
572 | SI1145_CMD_ALS_FORCE; | |
573 | ret = si1145_command(data, cmd); | |
574 | if (ret < 0 && ret != -EOVERFLOW) | |
575 | return ret; | |
576 | ||
577 | return i2c_smbus_read_word_data(data->client, chan->address); | |
578 | } | |
579 | ||
580 | /* | |
581 | * Conversion between iio scale and ADC_GAIN values | |
582 | * These could be further adjusted but proximity/intensity are dimensionless | |
583 | */ | |
584 | static const int si1145_proximity_scale_available[] = { | |
585 | 128, 64, 32, 16, 8, 4}; | |
586 | static const int si1145_intensity_scale_available[] = { | |
587 | 128, 64, 32, 16, 8, 4, 2, 1}; | |
588 | static IIO_CONST_ATTR(in_proximity_scale_available, | |
589 | "128 64 32 16 8 4"); | |
590 | static IIO_CONST_ATTR(in_intensity_scale_available, | |
591 | "128 64 32 16 8 4 2 1"); | |
592 | static IIO_CONST_ATTR(in_intensity_ir_scale_available, | |
593 | "128 64 32 16 8 4 2 1"); | |
594 | ||
595 | static int si1145_scale_from_adcgain(int regval) | |
596 | { | |
597 | return 128 >> regval; | |
598 | } | |
599 | ||
600 | static int si1145_proximity_adcgain_from_scale(int val, int val2) | |
601 | { | |
602 | val = find_closest_descending(val, si1145_proximity_scale_available, | |
603 | ARRAY_SIZE(si1145_proximity_scale_available)); | |
604 | if (val < 0 || val > 5 || val2 != 0) | |
605 | return -EINVAL; | |
606 | ||
607 | return val; | |
608 | } | |
609 | ||
610 | static int si1145_intensity_adcgain_from_scale(int val, int val2) | |
611 | { | |
612 | val = find_closest_descending(val, si1145_intensity_scale_available, | |
613 | ARRAY_SIZE(si1145_intensity_scale_available)); | |
614 | if (val < 0 || val > 7 || val2 != 0) | |
615 | return -EINVAL; | |
616 | ||
617 | return val; | |
618 | } | |
619 | ||
620 | static int si1145_read_raw(struct iio_dev *indio_dev, | |
621 | struct iio_chan_spec const *chan, | |
622 | int *val, int *val2, long mask) | |
623 | { | |
624 | struct si1145_data *data = iio_priv(indio_dev); | |
625 | int ret; | |
626 | u8 reg; | |
627 | ||
628 | switch (mask) { | |
629 | case IIO_CHAN_INFO_RAW: | |
630 | switch (chan->type) { | |
631 | case IIO_INTENSITY: | |
632 | case IIO_PROXIMITY: | |
633 | case IIO_VOLTAGE: | |
634 | case IIO_TEMP: | |
635 | case IIO_UVINDEX: | |
636 | ret = iio_device_claim_direct_mode(indio_dev); | |
637 | if (ret) | |
638 | return ret; | |
639 | ret = si1145_measure(indio_dev, chan); | |
640 | iio_device_release_direct_mode(indio_dev); | |
641 | ||
642 | if (ret < 0) | |
643 | return ret; | |
644 | ||
645 | *val = ret; | |
646 | ||
647 | return IIO_VAL_INT; | |
648 | case IIO_CURRENT: | |
649 | ret = i2c_smbus_read_byte_data(data->client, | |
650 | SI1145_PS_LED_REG(chan->channel)); | |
651 | if (ret < 0) | |
652 | return ret; | |
653 | ||
654 | *val = (ret >> SI1145_PS_LED_SHIFT(chan->channel)) | |
655 | & 0x0f; | |
656 | ||
657 | return IIO_VAL_INT; | |
658 | default: | |
659 | return -EINVAL; | |
660 | } | |
661 | case IIO_CHAN_INFO_SCALE: | |
662 | switch (chan->type) { | |
663 | case IIO_PROXIMITY: | |
664 | reg = SI1145_PARAM_PS_ADC_GAIN; | |
665 | break; | |
666 | case IIO_INTENSITY: | |
667 | if (chan->channel2 == IIO_MOD_LIGHT_IR) | |
668 | reg = SI1145_PARAM_ALSIR_ADC_GAIN; | |
669 | else | |
670 | reg = SI1145_PARAM_ALSVIS_ADC_GAIN; | |
671 | break; | |
672 | case IIO_TEMP: | |
673 | *val = 28; | |
674 | *val2 = 571429; | |
675 | return IIO_VAL_INT_PLUS_MICRO; | |
676 | case IIO_UVINDEX: | |
677 | *val = 0; | |
678 | *val2 = 10000; | |
679 | return IIO_VAL_INT_PLUS_MICRO; | |
680 | default: | |
681 | return -EINVAL; | |
682 | } | |
683 | ||
684 | ret = si1145_param_query(data, reg); | |
685 | if (ret < 0) | |
686 | return ret; | |
687 | ||
688 | *val = si1145_scale_from_adcgain(ret & 0x07); | |
689 | ||
690 | return IIO_VAL_INT; | |
691 | case IIO_CHAN_INFO_OFFSET: | |
692 | switch (chan->type) { | |
693 | case IIO_TEMP: | |
694 | /* | |
695 | * -ADC offset - ADC counts @ 25°C - | |
696 | * 35 * ADC counts / °C | |
697 | */ | |
698 | *val = -256 - 11136 + 25 * 35; | |
699 | return IIO_VAL_INT; | |
700 | default: | |
701 | /* | |
702 | * All ADC measurements have are by default offset | |
703 | * by -256 | |
704 | * See AN498 5.6.3 | |
705 | */ | |
706 | ret = si1145_param_query(data, SI1145_PARAM_ADC_OFFSET); | |
707 | if (ret < 0) | |
708 | return ret; | |
709 | *val = -si1145_uncompress(ret); | |
710 | return IIO_VAL_INT; | |
711 | } | |
712 | case IIO_CHAN_INFO_SAMP_FREQ: | |
713 | return si1145_read_samp_freq(data, val, val2); | |
714 | default: | |
715 | return -EINVAL; | |
716 | } | |
717 | } | |
718 | ||
719 | static int si1145_write_raw(struct iio_dev *indio_dev, | |
720 | struct iio_chan_spec const *chan, | |
721 | int val, int val2, long mask) | |
722 | { | |
723 | struct si1145_data *data = iio_priv(indio_dev); | |
724 | u8 reg1, reg2, shift; | |
725 | int ret; | |
726 | ||
727 | switch (mask) { | |
728 | case IIO_CHAN_INFO_SCALE: | |
729 | switch (chan->type) { | |
730 | case IIO_PROXIMITY: | |
731 | val = si1145_proximity_adcgain_from_scale(val, val2); | |
732 | if (val < 0) | |
733 | return val; | |
734 | reg1 = SI1145_PARAM_PS_ADC_GAIN; | |
735 | reg2 = SI1145_PARAM_PS_ADC_COUNTER; | |
736 | break; | |
737 | case IIO_INTENSITY: | |
738 | val = si1145_intensity_adcgain_from_scale(val, val2); | |
739 | if (val < 0) | |
740 | return val; | |
741 | if (chan->channel2 == IIO_MOD_LIGHT_IR) { | |
742 | reg1 = SI1145_PARAM_ALSIR_ADC_GAIN; | |
743 | reg2 = SI1145_PARAM_ALSIR_ADC_COUNTER; | |
744 | } else { | |
745 | reg1 = SI1145_PARAM_ALSVIS_ADC_GAIN; | |
746 | reg2 = SI1145_PARAM_ALSVIS_ADC_COUNTER; | |
747 | } | |
748 | break; | |
749 | default: | |
750 | return -EINVAL; | |
751 | } | |
752 | ||
753 | ret = iio_device_claim_direct_mode(indio_dev); | |
754 | if (ret) | |
755 | return ret; | |
756 | ||
757 | ret = si1145_param_set(data, reg1, val); | |
758 | if (ret < 0) { | |
759 | iio_device_release_direct_mode(indio_dev); | |
760 | return ret; | |
761 | } | |
762 | /* Set recovery period to one's complement of gain */ | |
763 | ret = si1145_param_set(data, reg2, (~val & 0x07) << 4); | |
764 | iio_device_release_direct_mode(indio_dev); | |
765 | return ret; | |
766 | case IIO_CHAN_INFO_RAW: | |
767 | if (chan->type != IIO_CURRENT) | |
768 | return -EINVAL; | |
769 | ||
770 | if (val < 0 || val > 15 || val2 != 0) | |
771 | return -EINVAL; | |
772 | ||
773 | reg1 = SI1145_PS_LED_REG(chan->channel); | |
774 | shift = SI1145_PS_LED_SHIFT(chan->channel); | |
775 | ||
776 | ret = iio_device_claim_direct_mode(indio_dev); | |
777 | if (ret) | |
778 | return ret; | |
779 | ||
780 | ret = i2c_smbus_read_byte_data(data->client, reg1); | |
781 | if (ret < 0) { | |
782 | iio_device_release_direct_mode(indio_dev); | |
783 | return ret; | |
784 | } | |
785 | ret = i2c_smbus_write_byte_data(data->client, reg1, | |
786 | (ret & ~(0x0f << shift)) | | |
787 | ((val & 0x0f) << shift)); | |
788 | iio_device_release_direct_mode(indio_dev); | |
789 | return ret; | |
790 | case IIO_CHAN_INFO_SAMP_FREQ: | |
791 | return si1145_store_samp_freq(data, val); | |
792 | default: | |
793 | return -EINVAL; | |
794 | } | |
795 | } | |
796 | ||
797 | #define SI1145_ST { \ | |
798 | .sign = 'u', \ | |
799 | .realbits = 16, \ | |
800 | .storagebits = 16, \ | |
801 | .endianness = IIO_LE, \ | |
802 | } | |
803 | ||
804 | #define SI1145_INTENSITY_CHANNEL(_si) { \ | |
805 | .type = IIO_INTENSITY, \ | |
806 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ | |
807 | BIT(IIO_CHAN_INFO_OFFSET) | \ | |
808 | BIT(IIO_CHAN_INFO_SCALE), \ | |
809 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
810 | .scan_type = SI1145_ST, \ | |
811 | .scan_index = _si, \ | |
812 | .address = SI1145_REG_ALSVIS_DATA, \ | |
813 | } | |
814 | ||
815 | #define SI1145_INTENSITY_IR_CHANNEL(_si) { \ | |
816 | .type = IIO_INTENSITY, \ | |
817 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ | |
818 | BIT(IIO_CHAN_INFO_OFFSET) | \ | |
819 | BIT(IIO_CHAN_INFO_SCALE), \ | |
820 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
821 | .modified = 1, \ | |
822 | .channel2 = IIO_MOD_LIGHT_IR, \ | |
823 | .scan_type = SI1145_ST, \ | |
824 | .scan_index = _si, \ | |
825 | .address = SI1145_REG_ALSIR_DATA, \ | |
826 | } | |
827 | ||
828 | #define SI1145_TEMP_CHANNEL(_si) { \ | |
829 | .type = IIO_TEMP, \ | |
830 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ | |
831 | BIT(IIO_CHAN_INFO_OFFSET) | \ | |
832 | BIT(IIO_CHAN_INFO_SCALE), \ | |
833 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
834 | .scan_type = SI1145_ST, \ | |
835 | .scan_index = _si, \ | |
836 | .address = SI1145_REG_AUX_DATA, \ | |
837 | } | |
838 | ||
839 | #define SI1145_UV_CHANNEL(_si) { \ | |
840 | .type = IIO_UVINDEX, \ | |
841 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ | |
842 | BIT(IIO_CHAN_INFO_SCALE), \ | |
843 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
844 | .scan_type = SI1145_ST, \ | |
845 | .scan_index = _si, \ | |
846 | .address = SI1145_REG_AUX_DATA, \ | |
847 | } | |
848 | ||
849 | #define SI1145_PROXIMITY_CHANNEL(_si, _ch) { \ | |
850 | .type = IIO_PROXIMITY, \ | |
851 | .indexed = 1, \ | |
852 | .channel = _ch, \ | |
853 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
854 | .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ | |
855 | BIT(IIO_CHAN_INFO_OFFSET), \ | |
856 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
857 | .scan_type = SI1145_ST, \ | |
858 | .scan_index = _si, \ | |
859 | .address = SI1145_REG_PS1_DATA + _ch * 2, \ | |
860 | } | |
861 | ||
862 | #define SI1145_VOLTAGE_CHANNEL(_si) { \ | |
863 | .type = IIO_VOLTAGE, \ | |
864 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
865 | .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ | |
866 | .scan_type = SI1145_ST, \ | |
867 | .scan_index = _si, \ | |
868 | .address = SI1145_REG_AUX_DATA, \ | |
869 | } | |
870 | ||
871 | #define SI1145_CURRENT_CHANNEL(_ch) { \ | |
872 | .type = IIO_CURRENT, \ | |
873 | .indexed = 1, \ | |
874 | .channel = _ch, \ | |
875 | .output = 1, \ | |
876 | .scan_index = -1, \ | |
877 | .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ | |
878 | } | |
879 | ||
880 | static const struct iio_chan_spec si1132_channels[] = { | |
881 | SI1145_INTENSITY_CHANNEL(0), | |
882 | SI1145_INTENSITY_IR_CHANNEL(1), | |
883 | SI1145_TEMP_CHANNEL(2), | |
884 | SI1145_VOLTAGE_CHANNEL(3), | |
885 | SI1145_UV_CHANNEL(4), | |
886 | IIO_CHAN_SOFT_TIMESTAMP(6), | |
887 | }; | |
888 | ||
889 | static const struct iio_chan_spec si1141_channels[] = { | |
890 | SI1145_INTENSITY_CHANNEL(0), | |
891 | SI1145_INTENSITY_IR_CHANNEL(1), | |
892 | SI1145_PROXIMITY_CHANNEL(2, 0), | |
893 | SI1145_TEMP_CHANNEL(3), | |
894 | SI1145_VOLTAGE_CHANNEL(4), | |
895 | IIO_CHAN_SOFT_TIMESTAMP(5), | |
896 | SI1145_CURRENT_CHANNEL(0), | |
897 | }; | |
898 | ||
899 | static const struct iio_chan_spec si1142_channels[] = { | |
900 | SI1145_INTENSITY_CHANNEL(0), | |
901 | SI1145_INTENSITY_IR_CHANNEL(1), | |
902 | SI1145_PROXIMITY_CHANNEL(2, 0), | |
903 | SI1145_PROXIMITY_CHANNEL(3, 1), | |
904 | SI1145_TEMP_CHANNEL(4), | |
905 | SI1145_VOLTAGE_CHANNEL(5), | |
906 | IIO_CHAN_SOFT_TIMESTAMP(6), | |
907 | SI1145_CURRENT_CHANNEL(0), | |
908 | SI1145_CURRENT_CHANNEL(1), | |
909 | }; | |
910 | ||
911 | static const struct iio_chan_spec si1143_channels[] = { | |
912 | SI1145_INTENSITY_CHANNEL(0), | |
913 | SI1145_INTENSITY_IR_CHANNEL(1), | |
914 | SI1145_PROXIMITY_CHANNEL(2, 0), | |
915 | SI1145_PROXIMITY_CHANNEL(3, 1), | |
916 | SI1145_PROXIMITY_CHANNEL(4, 2), | |
917 | SI1145_TEMP_CHANNEL(5), | |
918 | SI1145_VOLTAGE_CHANNEL(6), | |
919 | IIO_CHAN_SOFT_TIMESTAMP(7), | |
920 | SI1145_CURRENT_CHANNEL(0), | |
921 | SI1145_CURRENT_CHANNEL(1), | |
922 | SI1145_CURRENT_CHANNEL(2), | |
923 | }; | |
924 | ||
925 | static const struct iio_chan_spec si1145_channels[] = { | |
926 | SI1145_INTENSITY_CHANNEL(0), | |
927 | SI1145_INTENSITY_IR_CHANNEL(1), | |
928 | SI1145_PROXIMITY_CHANNEL(2, 0), | |
929 | SI1145_TEMP_CHANNEL(3), | |
930 | SI1145_VOLTAGE_CHANNEL(4), | |
931 | SI1145_UV_CHANNEL(5), | |
932 | IIO_CHAN_SOFT_TIMESTAMP(6), | |
933 | SI1145_CURRENT_CHANNEL(0), | |
934 | }; | |
935 | ||
936 | static const struct iio_chan_spec si1146_channels[] = { | |
937 | SI1145_INTENSITY_CHANNEL(0), | |
938 | SI1145_INTENSITY_IR_CHANNEL(1), | |
939 | SI1145_TEMP_CHANNEL(2), | |
940 | SI1145_VOLTAGE_CHANNEL(3), | |
941 | SI1145_UV_CHANNEL(4), | |
942 | SI1145_PROXIMITY_CHANNEL(5, 0), | |
943 | SI1145_PROXIMITY_CHANNEL(6, 1), | |
944 | IIO_CHAN_SOFT_TIMESTAMP(7), | |
945 | SI1145_CURRENT_CHANNEL(0), | |
946 | SI1145_CURRENT_CHANNEL(1), | |
947 | }; | |
948 | ||
949 | static const struct iio_chan_spec si1147_channels[] = { | |
950 | SI1145_INTENSITY_CHANNEL(0), | |
951 | SI1145_INTENSITY_IR_CHANNEL(1), | |
952 | SI1145_PROXIMITY_CHANNEL(2, 0), | |
953 | SI1145_PROXIMITY_CHANNEL(3, 1), | |
954 | SI1145_PROXIMITY_CHANNEL(4, 2), | |
955 | SI1145_TEMP_CHANNEL(5), | |
956 | SI1145_VOLTAGE_CHANNEL(6), | |
957 | SI1145_UV_CHANNEL(7), | |
958 | IIO_CHAN_SOFT_TIMESTAMP(8), | |
959 | SI1145_CURRENT_CHANNEL(0), | |
960 | SI1145_CURRENT_CHANNEL(1), | |
961 | SI1145_CURRENT_CHANNEL(2), | |
962 | }; | |
963 | ||
964 | static struct attribute *si1132_attributes[] = { | |
965 | &iio_const_attr_in_intensity_scale_available.dev_attr.attr, | |
966 | &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr, | |
967 | NULL, | |
968 | }; | |
969 | ||
970 | static struct attribute *si114x_attributes[] = { | |
971 | &iio_const_attr_in_intensity_scale_available.dev_attr.attr, | |
972 | &iio_const_attr_in_intensity_ir_scale_available.dev_attr.attr, | |
973 | &iio_const_attr_in_proximity_scale_available.dev_attr.attr, | |
974 | NULL, | |
975 | }; | |
976 | ||
977 | static const struct attribute_group si1132_attribute_group = { | |
978 | .attrs = si1132_attributes, | |
979 | }; | |
980 | ||
981 | static const struct attribute_group si114x_attribute_group = { | |
982 | .attrs = si114x_attributes, | |
983 | }; | |
984 | ||
985 | ||
986 | static const struct iio_info si1132_info = { | |
987 | .read_raw = si1145_read_raw, | |
988 | .write_raw = si1145_write_raw, | |
ac45e57f PMS |
989 | .attrs = &si1132_attribute_group, |
990 | }; | |
991 | ||
992 | static const struct iio_info si114x_info = { | |
993 | .read_raw = si1145_read_raw, | |
994 | .write_raw = si1145_write_raw, | |
ac45e57f PMS |
995 | .attrs = &si114x_attribute_group, |
996 | }; | |
997 | ||
998 | #define SI1145_PART(id, iio_info, chans, leds, uncompressed_meas_rate) \ | |
999 | {id, iio_info, chans, ARRAY_SIZE(chans), leds, uncompressed_meas_rate} | |
1000 | ||
1001 | static const struct si1145_part_info si1145_part_info[] = { | |
1002 | [SI1132] = SI1145_PART(0x32, &si1132_info, si1132_channels, 0, true), | |
1003 | [SI1141] = SI1145_PART(0x41, &si114x_info, si1141_channels, 1, false), | |
1004 | [SI1142] = SI1145_PART(0x42, &si114x_info, si1142_channels, 2, false), | |
1005 | [SI1143] = SI1145_PART(0x43, &si114x_info, si1143_channels, 3, false), | |
1006 | [SI1145] = SI1145_PART(0x45, &si114x_info, si1145_channels, 1, true), | |
1007 | [SI1146] = SI1145_PART(0x46, &si114x_info, si1146_channels, 2, true), | |
1008 | [SI1147] = SI1145_PART(0x47, &si114x_info, si1147_channels, 3, true), | |
1009 | }; | |
1010 | ||
1011 | static int si1145_initialize(struct si1145_data *data) | |
1012 | { | |
1013 | struct i2c_client *client = data->client; | |
1014 | int ret; | |
1015 | ||
1016 | ret = i2c_smbus_write_byte_data(client, SI1145_REG_COMMAND, | |
1017 | SI1145_CMD_RESET); | |
1018 | if (ret < 0) | |
1019 | return ret; | |
1020 | msleep(SI1145_COMMAND_TIMEOUT_MS); | |
1021 | ||
1022 | /* Hardware key, magic value */ | |
1023 | ret = i2c_smbus_write_byte_data(client, SI1145_REG_HW_KEY, 0x17); | |
1024 | if (ret < 0) | |
1025 | return ret; | |
1026 | msleep(SI1145_COMMAND_TIMEOUT_MS); | |
1027 | ||
1028 | /* Turn off autonomous mode */ | |
1029 | ret = si1145_set_meas_rate(data, 0); | |
1030 | if (ret < 0) | |
1031 | return ret; | |
1032 | ||
1033 | /* Initialize sampling freq to 10 Hz */ | |
1034 | ret = si1145_store_samp_freq(data, 10); | |
1035 | if (ret < 0) | |
1036 | return ret; | |
1037 | ||
1038 | /* Set LED currents to 45 mA; have 4 bits, see Table 2 in datasheet */ | |
1039 | switch (data->part_info->num_leds) { | |
1040 | case 3: | |
1041 | ret = i2c_smbus_write_byte_data(client, | |
1042 | SI1145_REG_PS_LED3, | |
1043 | SI1145_LED_CURRENT_45mA); | |
1044 | if (ret < 0) | |
1045 | return ret; | |
1046 | /* fallthrough */ | |
1047 | case 2: | |
1048 | ret = i2c_smbus_write_byte_data(client, | |
1049 | SI1145_REG_PS_LED21, | |
1050 | (SI1145_LED_CURRENT_45mA << 4) | | |
1051 | SI1145_LED_CURRENT_45mA); | |
1052 | break; | |
1053 | case 1: | |
1054 | ret = i2c_smbus_write_byte_data(client, | |
1055 | SI1145_REG_PS_LED21, | |
1056 | SI1145_LED_CURRENT_45mA); | |
1057 | break; | |
1058 | default: | |
1059 | ret = 0; | |
1060 | break; | |
1061 | } | |
1062 | if (ret < 0) | |
1063 | return ret; | |
1064 | ||
1065 | /* Set normal proximity measurement mode */ | |
1066 | ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_MISC, | |
1067 | SI1145_PS_ADC_MODE_NORMAL); | |
1068 | if (ret < 0) | |
1069 | return ret; | |
1070 | ||
1071 | ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_GAIN, 0x01); | |
1072 | if (ret < 0) | |
1073 | return ret; | |
1074 | ||
1075 | /* ADC_COUNTER should be one complement of ADC_GAIN */ | |
1076 | ret = si1145_param_set(data, SI1145_PARAM_PS_ADC_COUNTER, 0x06 << 4); | |
1077 | if (ret < 0) | |
1078 | return ret; | |
1079 | ||
1080 | /* Set ALS visible measurement mode */ | |
1081 | ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_MISC, | |
1082 | SI1145_ADC_MISC_RANGE); | |
1083 | if (ret < 0) | |
1084 | return ret; | |
1085 | ||
1086 | ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_GAIN, 0x03); | |
1087 | if (ret < 0) | |
1088 | return ret; | |
1089 | ||
1090 | ret = si1145_param_set(data, SI1145_PARAM_ALSVIS_ADC_COUNTER, | |
1091 | 0x04 << 4); | |
1092 | if (ret < 0) | |
1093 | return ret; | |
1094 | ||
1095 | /* Set ALS IR measurement mode */ | |
1096 | ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_MISC, | |
1097 | SI1145_ADC_MISC_RANGE); | |
1098 | if (ret < 0) | |
1099 | return ret; | |
1100 | ||
1101 | ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_GAIN, 0x01); | |
1102 | if (ret < 0) | |
1103 | return ret; | |
1104 | ||
1105 | ret = si1145_param_set(data, SI1145_PARAM_ALSIR_ADC_COUNTER, | |
1106 | 0x06 << 4); | |
1107 | if (ret < 0) | |
1108 | return ret; | |
1109 | ||
1110 | /* | |
1111 | * Initialize UCOEF to default values in datasheet | |
1112 | * These registers are normally zero on reset | |
1113 | */ | |
1114 | if (data->part_info == &si1145_part_info[SI1132] || | |
1115 | data->part_info == &si1145_part_info[SI1145] || | |
1116 | data->part_info == &si1145_part_info[SI1146] || | |
1117 | data->part_info == &si1145_part_info[SI1147]) { | |
1118 | ret = i2c_smbus_write_byte_data(data->client, | |
1119 | SI1145_REG_UCOEF1, | |
1120 | SI1145_UCOEF1_DEFAULT); | |
1121 | if (ret < 0) | |
1122 | return ret; | |
1123 | ret = i2c_smbus_write_byte_data(data->client, | |
1124 | SI1145_REG_UCOEF2, SI1145_UCOEF2_DEFAULT); | |
1125 | if (ret < 0) | |
1126 | return ret; | |
1127 | ret = i2c_smbus_write_byte_data(data->client, | |
1128 | SI1145_REG_UCOEF3, SI1145_UCOEF3_DEFAULT); | |
1129 | if (ret < 0) | |
1130 | return ret; | |
1131 | ret = i2c_smbus_write_byte_data(data->client, | |
1132 | SI1145_REG_UCOEF4, SI1145_UCOEF4_DEFAULT); | |
1133 | if (ret < 0) | |
1134 | return ret; | |
1135 | } | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | /* | |
1141 | * Program the channels we want to measure with CMD_PSALS_AUTO. No need for | |
1142 | * _postdisable as we stop with CMD_PSALS_PAUSE; single measurement (direct) | |
1143 | * mode reprograms the channels list anyway... | |
1144 | */ | |
1145 | static int si1145_buffer_preenable(struct iio_dev *indio_dev) | |
1146 | { | |
1147 | struct si1145_data *data = iio_priv(indio_dev); | |
1148 | int ret; | |
1149 | ||
1150 | mutex_lock(&data->lock); | |
1151 | ret = si1145_set_chlist(indio_dev, *indio_dev->active_scan_mask); | |
1152 | mutex_unlock(&data->lock); | |
1153 | ||
1154 | return ret; | |
1155 | } | |
1156 | ||
1157 | static bool si1145_validate_scan_mask(struct iio_dev *indio_dev, | |
1158 | const unsigned long *scan_mask) | |
1159 | { | |
1160 | struct si1145_data *data = iio_priv(indio_dev); | |
1161 | unsigned int count = 0; | |
1162 | int i; | |
1163 | ||
1164 | /* Check that at most one AUX channel is enabled */ | |
1165 | for_each_set_bit(i, scan_mask, data->part_info->num_channels) { | |
1166 | if (indio_dev->channels[i].address == SI1145_REG_AUX_DATA) | |
1167 | count++; | |
1168 | } | |
1169 | ||
1170 | return count <= 1; | |
1171 | } | |
1172 | ||
1173 | static const struct iio_buffer_setup_ops si1145_buffer_setup_ops = { | |
1174 | .preenable = si1145_buffer_preenable, | |
1175 | .postenable = iio_triggered_buffer_postenable, | |
1176 | .predisable = iio_triggered_buffer_predisable, | |
1177 | .validate_scan_mask = si1145_validate_scan_mask, | |
1178 | }; | |
1179 | ||
1180 | /** | |
1181 | * si1145_trigger_set_state() - Set trigger state | |
1182 | * | |
1183 | * When not using triggers interrupts are disabled and measurement rate is | |
1184 | * set to zero in order to minimize power consumption. | |
1185 | */ | |
1186 | static int si1145_trigger_set_state(struct iio_trigger *trig, bool state) | |
1187 | { | |
1188 | struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig); | |
1189 | struct si1145_data *data = iio_priv(indio_dev); | |
1190 | int err = 0, ret; | |
1191 | ||
1192 | mutex_lock(&data->lock); | |
1193 | ||
1194 | if (state) { | |
1195 | data->autonomous = true; | |
1196 | err = i2c_smbus_write_byte_data(data->client, | |
1197 | SI1145_REG_INT_CFG, SI1145_INT_CFG_OE); | |
1198 | if (err < 0) | |
1199 | goto disable; | |
1200 | err = i2c_smbus_write_byte_data(data->client, | |
1201 | SI1145_REG_IRQ_ENABLE, SI1145_MASK_ALL_IE); | |
1202 | if (err < 0) | |
1203 | goto disable; | |
1204 | err = si1145_set_meas_rate(data, data->meas_rate); | |
1205 | if (err < 0) | |
1206 | goto disable; | |
1207 | err = si1145_command(data, SI1145_CMD_PSALS_AUTO); | |
1208 | if (err < 0) | |
1209 | goto disable; | |
1210 | } else { | |
1211 | disable: | |
1212 | /* Disable as much as possible skipping errors */ | |
1213 | ret = si1145_command(data, SI1145_CMD_PSALS_PAUSE); | |
1214 | if (ret < 0 && !err) | |
1215 | err = ret; | |
1216 | ret = si1145_set_meas_rate(data, 0); | |
1217 | if (ret < 0 && !err) | |
1218 | err = ret; | |
1219 | ret = i2c_smbus_write_byte_data(data->client, | |
1220 | SI1145_REG_IRQ_ENABLE, 0); | |
1221 | if (ret < 0 && !err) | |
1222 | err = ret; | |
1223 | ret = i2c_smbus_write_byte_data(data->client, | |
1224 | SI1145_REG_INT_CFG, 0); | |
1225 | if (ret < 0 && !err) | |
1226 | err = ret; | |
1227 | data->autonomous = false; | |
1228 | } | |
1229 | ||
1230 | mutex_unlock(&data->lock); | |
1231 | return err; | |
1232 | } | |
1233 | ||
1234 | static const struct iio_trigger_ops si1145_trigger_ops = { | |
ac45e57f PMS |
1235 | .set_trigger_state = si1145_trigger_set_state, |
1236 | }; | |
1237 | ||
1238 | static int si1145_probe_trigger(struct iio_dev *indio_dev) | |
1239 | { | |
1240 | struct si1145_data *data = iio_priv(indio_dev); | |
1241 | struct i2c_client *client = data->client; | |
1242 | struct iio_trigger *trig; | |
1243 | int ret; | |
1244 | ||
1245 | trig = devm_iio_trigger_alloc(&client->dev, | |
1246 | "%s-dev%d", indio_dev->name, indio_dev->id); | |
1247 | if (!trig) | |
1248 | return -ENOMEM; | |
1249 | ||
1250 | trig->dev.parent = &client->dev; | |
1251 | trig->ops = &si1145_trigger_ops; | |
1252 | iio_trigger_set_drvdata(trig, indio_dev); | |
1253 | ||
1254 | ret = devm_request_irq(&client->dev, client->irq, | |
1255 | iio_trigger_generic_data_rdy_poll, | |
1256 | IRQF_TRIGGER_FALLING, | |
1257 | "si1145_irq", | |
1258 | trig); | |
1259 | if (ret < 0) { | |
1260 | dev_err(&client->dev, "irq request failed\n"); | |
1261 | return ret; | |
1262 | } | |
1263 | ||
1264 | ret = iio_trigger_register(trig); | |
1265 | if (ret) | |
1266 | return ret; | |
1267 | ||
1268 | data->trig = trig; | |
1269 | indio_dev->trig = iio_trigger_get(data->trig); | |
1270 | ||
1271 | return 0; | |
1272 | } | |
1273 | ||
1274 | static void si1145_remove_trigger(struct iio_dev *indio_dev) | |
1275 | { | |
1276 | struct si1145_data *data = iio_priv(indio_dev); | |
1277 | ||
1278 | if (data->trig) { | |
1279 | iio_trigger_unregister(data->trig); | |
1280 | data->trig = NULL; | |
1281 | } | |
1282 | } | |
1283 | ||
1284 | static int si1145_probe(struct i2c_client *client, | |
1285 | const struct i2c_device_id *id) | |
1286 | { | |
1287 | struct si1145_data *data; | |
1288 | struct iio_dev *indio_dev; | |
1289 | u8 part_id, rev_id, seq_id; | |
1290 | int ret; | |
1291 | ||
1292 | indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); | |
1293 | if (!indio_dev) | |
1294 | return -ENOMEM; | |
1295 | ||
1296 | data = iio_priv(indio_dev); | |
1297 | i2c_set_clientdata(client, indio_dev); | |
1298 | data->client = client; | |
1299 | data->part_info = &si1145_part_info[id->driver_data]; | |
1300 | ||
1301 | part_id = ret = i2c_smbus_read_byte_data(data->client, | |
1302 | SI1145_REG_PART_ID); | |
1303 | if (ret < 0) | |
1304 | return ret; | |
1305 | rev_id = ret = i2c_smbus_read_byte_data(data->client, | |
1306 | SI1145_REG_REV_ID); | |
1307 | if (ret < 0) | |
1308 | return ret; | |
1309 | seq_id = ret = i2c_smbus_read_byte_data(data->client, | |
1310 | SI1145_REG_SEQ_ID); | |
1311 | if (ret < 0) | |
1312 | return ret; | |
1313 | dev_info(&client->dev, "device ID part %#02hhx rev %#02hhx seq %#02hhx\n", | |
1314 | part_id, rev_id, seq_id); | |
1315 | if (part_id != data->part_info->part) { | |
1316 | dev_err(&client->dev, "part ID mismatch got %#02hhx, expected %#02x\n", | |
1317 | part_id, data->part_info->part); | |
1318 | return -ENODEV; | |
1319 | } | |
1320 | ||
1321 | indio_dev->dev.parent = &client->dev; | |
1322 | indio_dev->name = id->name; | |
1323 | indio_dev->channels = data->part_info->channels; | |
1324 | indio_dev->num_channels = data->part_info->num_channels; | |
1325 | indio_dev->info = data->part_info->iio_info; | |
1326 | indio_dev->modes = INDIO_DIRECT_MODE; | |
1327 | ||
1328 | mutex_init(&data->lock); | |
1329 | mutex_init(&data->cmdlock); | |
1330 | ||
1331 | ret = si1145_initialize(data); | |
1332 | if (ret < 0) | |
1333 | return ret; | |
1334 | ||
1335 | ret = iio_triggered_buffer_setup(indio_dev, NULL, | |
1336 | si1145_trigger_handler, &si1145_buffer_setup_ops); | |
1337 | if (ret < 0) | |
1338 | return ret; | |
1339 | ||
1340 | if (client->irq) { | |
1341 | ret = si1145_probe_trigger(indio_dev); | |
1342 | if (ret < 0) | |
1343 | goto error_free_buffer; | |
1344 | } else { | |
1345 | dev_info(&client->dev, "no irq, using polling\n"); | |
1346 | } | |
1347 | ||
1348 | ret = iio_device_register(indio_dev); | |
1349 | if (ret < 0) | |
1350 | goto error_free_trigger; | |
1351 | ||
1352 | return 0; | |
1353 | ||
1354 | error_free_trigger: | |
1355 | si1145_remove_trigger(indio_dev); | |
1356 | error_free_buffer: | |
1357 | iio_triggered_buffer_cleanup(indio_dev); | |
1358 | ||
1359 | return ret; | |
1360 | } | |
1361 | ||
1362 | static const struct i2c_device_id si1145_ids[] = { | |
1363 | { "si1132", SI1132 }, | |
1364 | { "si1141", SI1141 }, | |
1365 | { "si1142", SI1142 }, | |
1366 | { "si1143", SI1143 }, | |
1367 | { "si1145", SI1145 }, | |
1368 | { "si1146", SI1146 }, | |
1369 | { "si1147", SI1147 }, | |
1370 | { } | |
1371 | }; | |
1372 | MODULE_DEVICE_TABLE(i2c, si1145_ids); | |
1373 | ||
1374 | static int si1145_remove(struct i2c_client *client) | |
1375 | { | |
1376 | struct iio_dev *indio_dev = i2c_get_clientdata(client); | |
1377 | ||
1378 | iio_device_unregister(indio_dev); | |
1379 | si1145_remove_trigger(indio_dev); | |
1380 | iio_triggered_buffer_cleanup(indio_dev); | |
1381 | ||
1382 | return 0; | |
1383 | } | |
1384 | ||
1385 | static struct i2c_driver si1145_driver = { | |
1386 | .driver = { | |
1387 | .name = "si1145", | |
1388 | }, | |
1389 | .probe = si1145_probe, | |
1390 | .remove = si1145_remove, | |
1391 | .id_table = si1145_ids, | |
1392 | }; | |
1393 | ||
1394 | module_i2c_driver(si1145_driver); | |
1395 | ||
1396 | MODULE_AUTHOR("Peter Meerwald-Stadler <pmeerw@pmeerw.net>"); | |
1397 | MODULE_DESCRIPTION("Silabs SI1132 and SI1141/2/3/5/6/7 proximity, ambient light and UV index sensor driver"); | |
1398 | MODULE_LICENSE("GPL"); |